Andre Müller writes:
> I'm a fan of infinite sequences. Try out itertools.islice.
> You should not underestimate this very important module.
>
> Please read also the documentation:
> https://docs.python.org/3.6/library/itertools.html
>
> from itertools import islice
>
> iterable = range(10000000000)
> # since Python 3 range is a lazy evaluated object
> # using this just as a dummy
> # if you're using legacy Python (2.x), then use the xrange function for it
> # or you'll get a memory error
>
> max_count = 10
> step = 1
>
> for i, element in enumerate(islice(iterable, 0, max_count, step), start=1):
> print(i, element)
I like to test this kind of thing with iter("abracadabra") and look at
the remaining elements, just to be sure that they are still there.
from itertools import islice
s = iter("abracadabra")
for i, element in enumerate(islice(s, 3)):
print(i, element)
print(''.join(s))
Prints this:
0 a
1 b
2 r
acadabra
One can do a similar check with iter(range(1000)). The range object
itself does not change when its elements are accessed.
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